Fuel Efficient Natural Gas Engine with Common-Rail Micro-Pilot Injection

Umierski, M.; Stommel, Peter

doi:10.4271/2000-01-3080

Cited by 12 publications

(4 citation statements)

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“…7 Reduction in CO 2 emissions has been observed compared to gasoline and diesel fuels with the same energy value due to its lower carbon content. 11,12 Because of 540°C self-ignition temperature and narrow flammability limits (5%-15%) of CNG (a clean fuel consisting largely of methane gas), ignition is usually provided by pilot diesel injection in diesel engines. 4 Biogas, produced by anaerobic fermentation of organic matter, is another alternative energy source.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this problem, it is more appropriate to ensure ignition by a small amount of diesel pilot injection. 12 Moreover, efficiency reduces due to the usage of natural gas at partial load in SI engines, throttle existence in Otto engines, and low compression ratios. 12 Combustion of methane and diesel at dual mode takes place in three modes: pilot diesel combustion, combustion of methane around the diesel spray, and the progress of the flame in methane-air mixture.…”

Section: Introductionmentioning

confidence: 99%

“…12 Moreover, efficiency reduces due to the usage of natural gas at partial load in SI engines, throttle existence in Otto engines, and low compression ratios. 12 Combustion of methane and diesel at dual mode takes place in three modes: pilot diesel combustion, combustion of methane around the diesel spray, and the progress of the flame in methane-air mixture. Extremely poor mixture, flame extinction zone increase, and incomplete combustion for all three sections at low loads can result with the increase in HC and CO emissions.…”

Section: Introductionmentioning

confidence: 99%

“…Figure12. Variation of the in-cylinder pressure with crank angle according to several natural gas energy fractions at a 1500 r/min constant engine speed.…”

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confidence: 99%

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Effect of the use of natural gas–diesel fuel mixture on performance, emissions, and combustion characteristics of a compression ignition engine

Karagöz

Sandalcı

Köylü

et al. 2016

Advances in Mechanical Engineering

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A compression ignition engine with a mechanical fuel system was converted into common rail fuel system by means of a self-developed electronic control unit. The engine was modified to be operated with mixtures of diesel and natural gas fuels in dual-fuel mode. Then, diesel fuel was injected into the cylinder while natural gas was injected into intake manifold with both injectors controlled with the electronic control unit. Energy content of the sprayed gas fuel was varied in the amounts of 0% (only diesel fuel), 15%, 40%, and 75% of total fuel’s energy content. All tests were carried out at constant engine speed of 1500 r/min at full load. In addition to the experiments, the engine was modeled with a one-dimensional commercial software. The experimental and numerical results were compared and found to be in reasonable agreement with each other. Both NOx and soot emissions were dropped with 15% and 40%, respectively, energy content rates in gas–fuel mixture compared to only diesel fuel. However, an increase was observed in carbon monoxide emissions with 15% natural gas fuel addition compared to only diesel fuel. Although smoke emission was reduced with natural gas fuel addition, there was a dramatic increase in NOx emissions with 75% natural gas fuel addition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Figure12. Variation of the in-cylinder pressure with crank angle according to several natural gas energy fractions at a 1500 r/min constant engine speed.…”

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confidence: 99%

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